The M2 is a CJ1+ derivative, and is on the same type rating - it is a 525.
It does seem to have some nice upgrades though - new engines and winglets to give improved performance (400 knot cruise predicted) and slightly better range. Cabin is the same as the CJ1, MTOW is 10,700 pounds. Many interior redesign tweaks, which may or may not be an improvement. Biggest downside is that the cockpit is now Garmin Gx000 instead of Proline 21, but that is presumably the main reason they got the price down.